martin



June 14', 1932. R. MARTIN CALCULATING MACHINE Filed June 22, 1927 4Sheets-Sheet 2 I l l I I l I Invenfor: MQW/VZ 7744/1/64 June 14, 1932.R. MARTIN CALCULATING MACHINE 4 Sheets-Sheet 3 Filed June 22, 1927@VUUUUDDQUU In venior:

R. MARTIN 1,362,901

CALCULATING MACHINE 4 Sheets-Sheet 4 June 14, 1932.

Filed June 22, 1927 In Vents):

5/ it! lnls. IIIII I- 0 9 m- 8 M z. n. 1 u o 9 H l 2 g H H 210 MG EPatented June 14, 1932 UNITED STATES RUDOLF MARTIN,

PATENT OFFICE BERGMANN, OF BERLIN-WANNSEE, GERMANY CALCULATING MACHINEApplication. filed June 22, 1927, Serial No. 200,629, and in GermanyJune 16, 1925.

This invention refers broadly to calculating machines with rotatingcounting mechanism, and it is intended to devise means of simplifyingthe construction of the machine and to make provision fora simple,easily controlled and rapid operat on of the machine, and to accomplishothermportant objects and advantages which Wlll appear, as thespecification proceeds.

In view of the various objects of the 1n vention a circularly movingtotalizing or counting mechanism is combined with a casing section orthe like displaceable wlth relatlon thereto and provided with teeth orthe like and adapted to operate that port1on of the totalizing orcounting mechanism which operates as the adding mechanism. Thed1splacement is transmitted to the stopping mechanism which actuatesthat partot the counting or totalizing mechanism wl11ch oplerates as therotating counting mechanism. "The adding mechanism-referred to mayevidently be also made to act in the well-known manner as a subtractingmechanism, and 1s .25 also effective in combination with the multiplyingand dividing operation.

As regards the teeth or the like provided in the displaceablecasing-section, a certain number thereof, as is well-known, should bemoved into the operative position in accord ance with the figuressubmitted to the calculating operation. Now, in accordance with themeans provided by this invention, th1s setting of the teeth in theoperative or working position ma be performed in a very slmle manner byisposing the teeth on a flexible rack bar which is disposed in theareshaped casing in such a manner, as to be dislaceable in theperipheral direction there- 4 of, so that the operative position and the1Il operative position may be respectively produced merely byadisplacement of the rack .bar.

The general arrangement and construction of the machine according tothis invention makes it possible to impart an exceedingly simple andvery convenient format on to the moving mechanism for the tens digits,and it should be noted in particular that there is 6 no necessity ofmaking special provisions for the prevention of incorrect engagement ofthe rotating counting mechanism with the stops or the like for theactuation of the tensmoving means of the adding mechanism.

In the case of the bipartite formation of the counting Wheels, whichconstruction has already been suggested and in which in the operation ofdisplacement of the tens-digits the one wheel section is axiallydisplaced with relation to the other wheel section which is axiallystationary and not displaceable, and without thereby causing thedisengagement of the tappet-connection, of the two wheel sections, theaxial displacement of the disv placeable wheel section in one embodimentof the invent-ion may be effected by means of a guide arm movablydisposed upon the rotating shaft of thecircularly moving count ingmechanism. The upper extremity of this arm is adapted to engage in aguide groove provided on the wheel hub of the particular wheel sectionand being displaced upon each rotation of the counting wheel belongingto the preceding decade together with, the wheel section controlledthereby and with relation to the stationary wheel section, the saiddisplacement being efiected by a feeding stud on said counting wheel ofthe preceding decade.

After thedisplacement has been effected the displaceable wheel portionsin accordance with an exemplification of the invention -are made toengage with stopping pins arranged in a casing or acket of the generalshape of cylindrical jacket portions. In a preferred form ofconstruction the stops may be step-Wise and staggeringly arranged withrelation to each other in such a manner that they will become seriallyand not simultaneously engaged with the sections of the tensfeedingwheels of the different digits.

By means of a spring-actuated guide bar loosely connected to the ends ofthe guide arms and adapted to be laterally displaced by a disengagingtappet or the like provided in the wall of the casing and operated bythe rotation of the crank upon each rotation thereof, the uide arms andthe wheel sections connected therewith are automatically restored totheir normal position after the anism the general construction of themachine may be further simplified by coaxially disposing the addingmechanism and the rotating counting mechanism, and preferably upon oneand the same shaft which is circularly moved with relation to the crankshaft, and without any liability of incorrect engagement of the stopsfor the operation of the small counting wheels of the two countingmechanisms, as already referred to.

The rack bars heretofore mentioned and provided in connection-with thesetting mechanism are preferably made to consist of several sections,and in such a manner that the teeth, seen from the side of the rack bardisposed contrariwise to the indentation are mounted in bores orrecesses of supporting bars, and preferably so as to be readilyexchangeable and removable. The indentation in a preferred constructionmay for instance be obtained by corresponding bends of one or severalmetal bands.

The invention will be more fully and particularly described by referenceto the accompanying drawings in which Figure 1 represents the settingmechanism seen from above. Figure 2 is a side view; Figure 3 is a frontelevation of a calculating machine with setting mechanism incorporatedtherewith. Figure 4 is a plan View corresponding therewith. Figure 5 isa side view. Figure 6 shows the holding and supporting device arrangedin the lower part of the setting mechanism in sectional View, and Figure7 is a top plan view corresponding thereto. Figure 8 is a frontelevation of the counting mechanism; Figure 9 is a plan view thereof. Figure 10 is a side view, and Figure 11 shows a small wheel of thecounting mechanism and a tens-feeding-wheel (small coupling wheel) insectional view. Figures 12 and 13 represent a composite rack bar of thesetting mechanism'respectively in side elevation and as viewed from theside of the indentation.

Figures 14 and 15 are respectively side view' and top plan view of thedifferent parts of this kind of rack bar.

In the interior of the casing 2 which is mounted on the base plate 1,the laterally displaceable carriage 3 is arranged upon which the severalparts of the setting mechanism are disposed and which is guided by thestationary studs 4, 5. The front portion of the carriage 3 isprovidedwith a sheet metal cap 6 in the recessed portions 7 of which themanipulating buttons 13 are displaceably arranged. These buttons areconnected to the flexible rack bars 11 and are actuated by a spring 14.The said rack bars 11 are adapted to slide in a guideway 10 formed bythe guiding bands 8, 9 and are provided with a plurality of settingteeth 12.

As appears from Figures 12 to 15 the rack bars consist of a bar I)provided with recesses a spaced so as to correspond to the teeth, and ofa band 0 of steel, bronze or the like and provided with teeth 12 appliedthereto or produced by bending the band or bar 0 accordingly.

In order to restrict the lateral displacement of the carriage 3 to theparticular distance of a digit, the base plate 1 is provided with anarresting device, comprising a spring 17 and a roll 18 engageable withthe grooves 16 of a uide bar 15. i

pon the cross-sectionally four-cornered portion 23 of the shaft21provided with a manually operated crank 20 and rotatably mounted in thecasing 2 of the calculating machine the journal bearings 35 for theshaft of the. counting mechanism are secured by means of the screws 36.Upon the shaft 26v the counting wheels 22 of the result countingmechanism and the counting wheels 22 of' the rotating counting mechanismare arranged, which latter wheels are connected to the so-calledtens-feeding wheels 37 (coupling wheels) by the studs 38 which arepermanently and slidably engaged with correspond ing bores of thecounting wheels 22 and 22 The counting wheels may be laterally displacedbymeans of guide arms 39 likewise Inovably disposed upon thefour-cornered shaft 23 and the upper, fork-shaped portion of which isengaged with a guide groove provided in the wheel hub 40. This lateraldisplacement is effected in each case at the moment in which thetens-feeding stud 28 on the lower order counting wheel 22 strikes thecam 27 provided on the fork-shaped extrem ity of the guide-arm 39, thatis to say, after each complete rotation of the lower order countingwheel 22.

The lower ends 41 of the guide arm 39 project into engagement withnotches provided in a guide rod or bar 43 adapted to be operated by thedisengaging cam 29 and normally under tllu influence of a spring 42.

Furthermore, there are arranged in the slots Y of the cross-sectionallvfour-cornered shaft 23 the straps or yokes 33 in the head portion 44. ofwhich the pressure rollers 45 are mounted, which latter are adapted toplace themselves with uniform pressure between the teeth 25 of thecounting wheels 22 and 22' by the action of the spring 47 which istensioned between straps 33 and on a support 46. The pressure rollers45' also coact with the tens-feeding wheels 37 to peldably i ietain thelatter in adjusted position. The entire feeding mechanism is covered upby two circularly shaped jackets or housings 30, 32 provided at theirinsides with stopping pins 34 for the small counting wheels or for thefeeding pins 28 thereof for the tens feed. The housing 32 at its frontside portion is provided with inspection windows 31 (Figure 3) through"and subtracting operations, the carriage is displaced in such a mannerthat its righthand recess 7 liesjust below the small unit countingwheel. If it is desired to carry out multiplying or dividing operations,the carriage 3 is displaced according to the number of digits to theextent of one counting wheel or further to the left. After the lateraladjustment has been effected, the flexible racks 11 slidably arranged inthe path 10 are displaced according to the digit to be adjusted by meansof the buttons 13 connected to the racks (for the purpose of adjustingthe multiplicand or one of the sums) after the button 13 has beenpressed downwardly against the pressure of the spring 14 so that theenlarged portion of the button protrudes from the recesses 7. The smallwheels 22 of the counting mechanism rotatably mounted on the shaftperforming a circular movement around the driving shaft 21 come incontact at each rotation on the driving shaft wilh the teeth 12 of theracks 11 which through the displacement of the racks 11 have entered thepath of the wheels 22 of the counting mechanism so that at each rotationof the shaft 21, the small counting wheels 22 entering into engagementwith the teeth 12 undergo a larger or smaller rotation. If, forinstance, the numbers 96 and 72 are to be added, the small countingwheels are adjusted in the zero position and then the carriage 3 isadjusted, as already explained, so that the recess 7 furthest to theright registers with the small unit counting Wheel. Now the number 96 isset by means of the displaceable buttons 13 on the sheet-metal cap 6provided on the carriage 3 so that the unit 6 of the number 96 (seeFig. 1) is on the unit row and the tens-digit 9 is on the second row.The corresponding racks 11 thus become displaced in the curved part 3 ofthe carriage so that six and nine setting teeth g respectively are movedinto the operative position. During the operation of the countingmechanism, the small unit Wheel will be turned to the extent of sixteeth and the small tens wheel to the extent of nine teeth. The secondnumber 72 is set in the same manner and carried into the countingmechanism.

The laterally displaceable handle of the crank 20 engages after eachrotation in a groove provided therefor.

When one of the counting wheels, for instance, the unit counting wheelpasses from 9 to O or vice versa, the tens-shift pin 28 provided on thesmall counting wheel 22 comes in contact with the cam 27 on the upperpart of the guide arm 39 whereby the guide arm 39 or the tens shiftwheel 37 (coupling wheel) connected therewith, whose pins 38 engage inthe bores of the next counting wheel 22 registering, for instance, thetens will become displaced towards the counting wheel arranged on theleft-hand side thereof and thus assume a position in which, on therotation of the crank .20, the tens shift wheel 37 will come in contactwith the stop pin 34 provided on the inside of the casing or housing 32and corresponding thereto so that the said tens shift wheel is turned bythe pin to the extent of one tooth together with the small countingwheel coupled thereto.

The stop pins are arranged stepwise on the casings or housings 32, 30 inorder that a continuous consecutive tens transfer will take place. Thecasing or housing 32 arranged in front effects the tens transfer of theshifting mechanism when rotating to the right and the rear. casing orhousing 30 effects the tens transfer of the shifting mechanism whenrotating, to the left.

After the registration of the tens has been effected, the guide arms 39and the coupling wheels 37 connected thereto are again automaticallyrestored to their normal position by means of a guide rod 43, which isloosely connected to the ends 41 of the guide arms 39 and at eachrotation is laterally displaced by a disengaging cam 29 provided in thewall 2 of the casing.

The tens shifting or transfer in connection with the counting wheels 22of the rotary counting mechanism is effected in exactly the same manner.

I claim 1. Setting mechanism for calculating machines with planet-likecircularly moving counting mechanism including a flexible setting rackprovided with setting teeth and movable through a partly curved path.

2. Setting mechanism for calculating machines with planet-likecircularly moving counting mechanism including a carriage with guideshaving curved rear portions, and flexible setting racks provided withsetting movable in partly curved paths in said 1 es.

3. Setting mechanism for calculating machines with planet-likecircularly moving counting mechanism including a flexible setting rackprovided with setting teeth and movable through a partly curved path,said flexible setting rack including a supporting bar having openingstherein for the setting teeth.

4. Setting mechanism for calculating machines with planet-likecircularly moving counting mechanism including a flexible set

